Change G4 P to G4 S for Marlin
Marlin uses P for milliseconds, S for seconds.
FreeCAD uses P for seconds, so change P to S.
Remove code for G20 inch mode and G91 relative mode
Due to the fundamentals of the FreeCAD pre-processor,
this post processor can only operate in the following modes:
G90 Absolute positions
G21 Metric units (mm)
G17 XY plane (3 axis vertical milling only)
Expand RETURN_TO option to float values for XYZ
The RETURN_TO option previously only accepted integer values, and
only for X and Y.
This change allows float values for XY and optionally Z.
Add class: "Drill" within drill_translate()
The nested functions within drill_translate() need to modify the
variable that was named trBuff. To allow this, trBuff was changed
to class: "Drill" with property "gcode".
Within drill_translate(), including within the nested functions,
modifying "trBuff" is now replaced with modifying "Drill.gcode".
Merge in updated portions of grbl_post.py
Prior verson was derived from an older grbl_post.py.
Merge in the portions of the newer grbl that seem improved.
Refactor overall after the merge.
Add options for partial comments
Add option: --no-finish-comments
Add option: --no-path-comments
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